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Author Topic: Sonic booms  (Read 1972 times)

Offline JunkyII

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Sonic booms
« on: July 01, 2009, 02:27:17 AM »
Saw this picture and I thinks its probably the best of a jet breaking the sound barrier Ive seen

anyone got any better ones?
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Offline A8TOOL

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Re: Sonic booms
« Reply #1 on: July 01, 2009, 04:18:12 AM »
seen them.... don't got them
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Offline JunkyII

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Re: Sonic booms
« Reply #2 on: July 01, 2009, 04:50:29 AM »
Quote from: A8TOOL on July 01, 2009, 04:18:12 AM
seen them.... don't got them
yea this one i set as my desktop, i love the shadow on the raptor :salute
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Offline trigger2

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Re: Sonic booms
« Reply #3 on: July 01, 2009, 04:59:42 AM »
If I remember right that's the Prandtl–Glauert singularity which isn't breaking the sound barrier, but rather when it's traveling at transonic speeds. Feel free to correct me if I'm wrong. :D
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Offline JunkyII

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Re: Sonic booms
« Reply #4 on: July 01, 2009, 05:05:51 AM »
Quote from: trigger2 on July 01, 2009, 04:59:42 AM
If I remember right that's the Prandtl–Glauert singularity which isn't breaking the sound barrier, but rather when it's traveling at transonic speeds. Feel free to correct me if I'm wrong. :D
article says he was breaking sound barrier i believe :salute
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Offline trigger2

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Re: Sonic booms
« Reply #5 on: July 01, 2009, 05:47:18 AM »
Quote from: JunkyII on July 01, 2009, 05:05:51 AM
article says he was breaking sound barrier i believe :salute
Very well could have been, transonic is mach 0.8 - 1.2. The vapor cone you see there though is from the Prandtl–Glauert singularity. The vapor cone, regardless, has been seen as breaking sound barrier for some reason, when the vapor cone will appear mach 0.2 before breaking the sound barrier.

Just got off my lazy bum and researched it. Here's the wiki on it...
http://en.wikipedia.org/wiki/Prandtl%E2%80%93Glauert_singularity
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Offline antivortex

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Re: Sonic booms
« Reply #6 on: July 01, 2009, 07:29:02 AM »
Well then I guess this MD-11 is breaking the sound barrier too!

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Offline RufusLeaking

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Re: Sonic booms
« Reply #7 on: July 01, 2009, 08:43:19 AM »
The MD-11 shows water vapor forming in the area of low pressure on top of the wing under high humidity conditions.

There will be local shock waves forming on a plane in the transonic regime.  A shock wave is a sudden change in pressure.  This is what appears to be happening in the F-22 photo.

The term "breaking the sound barrier" is out dated.  Airflow around an airplane varies with geometry.  The discussion needs to be around Mach numbers, air pressure and humidity.
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Offline Denholm

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Re: Sonic booms
« Reply #8 on: July 01, 2009, 10:02:17 AM »
Quote from: antivortex on July 01, 2009, 07:29:02 AM
Well then I guess this MD-11 is breaking the sound barrier too!

(Image removed from quote.)
You need to pick up a few more books.
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Offline VonMessa

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Re: Sonic booms
« Reply #9 on: July 01, 2009, 10:07:11 AM »
Quote from: Denholm on July 01, 2009, 10:02:17 AM
You need to pick up a few more books.

Where can I get some more books?

Can I but them from an Amway salesman?

Cool pic, Junky.     Hope you are enjoying the Kim-Chi  :aok
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Offline Captfish

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Re: Sonic booms
« Reply #10 on: July 01, 2009, 10:33:37 AM »
Soooo cool  :aok
 I still remember the first time I felt one at an airshow, SWEEEEEEEEET  :x
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Offline moot

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Re: Sonic booms
« Reply #11 on: July 01, 2009, 10:44:26 AM »
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Offline Captfish

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Re: Sonic booms
« Reply #12 on: July 01, 2009, 11:51:29 AM »
your are better but this one is cool too

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Offline Shuffler

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Re: Sonic booms
« Reply #13 on: July 01, 2009, 11:54:46 AM »
Breaking the sound barrier... NOT
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Offline moot

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Re: Sonic booms
« Reply #14 on: July 01, 2009, 12:04:13 PM »
I've got one of those but zoomed in close and clear enough to see the shockwaves in the air itself, without any humidity.  Can't find it though.



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